74 lines
2.6 KiB
C++
74 lines
2.6 KiB
C++
/*******************************************************************************
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* The MIT License (MIT)
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*
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* Copyright (c) 2015 David Williams and Matthew Williams
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*******************************************************************************/
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#ifndef __PolyVox_Interpolation_H__
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#define __PolyVox_Interpolation_H__
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namespace PolyVox
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{
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template <typename Type>
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Type lerp(
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const Type& v0,const Type& v1,
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const float x)
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{
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//Interpolate along X
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Type v0_1 = (v1 - v0) * x + v0;
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return v0_1;
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}
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template <typename Type>
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Type bilerp(
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const Type& v00,const Type& v10,const Type& v01,const Type& v11,
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const float x, const float y)
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{
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// Linearly interpolate along x
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Type v00_10 = lerp(v00, v10, x);
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Type v01_11 = lerp(v01, v11, x);
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// And linearly interpolate the results along y
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Type v00_10__v01_11 = lerp(v00_10, v01_11, y);
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return v00_10__v01_11;
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}
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template <typename Type>
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Type trilerp(
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const Type& v000,const Type& v100,const Type& v010,const Type& v110,
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const Type& v001,const Type& v101,const Type& v011,const Type& v111,
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const float x, const float y, const float z)
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{
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// Bilinearly interpolate along Y
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Type v000_v100__v010_v110 = bilerp(v000, v100, v010, v110, x, y);
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Type v001_v101__v011_v111 = bilerp(v001, v101, v011, v111, x, y);
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// And linearly interpolate the results along z
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Type v000_v100__v010_v110____v001_v101__v011_v111 = lerp(v000_v100__v010_v110, v001_v101__v011_v111, z);
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return v000_v100__v010_v110____v001_v101__v011_v111;
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}
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}
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#endif //__PolyVox_Interpolation_H__
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